Since it has OO on the side, that is the beginning of the weight mark. OO meaning no hundredweights. Next would be 10, and then a number between one and ten. Hundredweight means English Hundredweights, or approx. 112 lbs., then tenth of a hundred, and finally parts per ten pounds. It is unusual for an anvil that small to have the hardy and pritchell holes, so was probably in the corner of the shop for light work like sheet metal. Might have to clean it off a bit and use chalk to find the number and name stamps. Glad it was saved.